IB Biology EE vs IA — Side-by-Side

Different, not easier. The IA is shorter (3,000 vs 4,000 words) and more structured (4 criteria × 6 marks mapped directly to experiment stages). The EE is longer, more independent, and rewards argumentation rather than procedural rigour. Students with strong writing usually find the EE easier; students with strong experimental design find the IA easier.

Yes. EE subject choice is independent of subject level — you can submit a Biology EE at SL. Most IB students choose an EE subject they take at HL for depth, but this is a preference not a requirement.

Usually IA first. Most students begin the IA in Year 1 once they have finished the relevant syllabus topic and are comfortable with data collection. The EE typically starts mid-Year 1 and extends into Year 2. Doing the IA first gives you a cleaner model for the EE methodology section.

No. The EE does not affect your Biology grade (1–7). Instead, it contributes to the Diploma core points: combined with TOK, you can earn up to 3 bonus points toward the 45-point Diploma total. The IA, by contrast, contributes 20% directly to your Biology grade.

You can use a similar experimental approach but the research question must be substantively different. Near-identical IA and EE submissions will be flagged as potential malpractice. A good rule: change either the organism/system, the independent variable, or the analytical framing between them.